4 files changed, 452 insertions, 0 deletions
diff --git a/saving_plots/quickref.tex b/saving_plots/quickref.tex
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+Saving a plot(png):\\
+{\ex \lstinline|    savefig('filename.png')|}
+
+Saving a plot(pdf):\\
+{\ex \lstinline|    savefig('filename.pdf')|}
diff --git a/saving_plots/script.rst b/saving_plots/script.rst
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+.. Objectives
+.. ----------
+
+.. At the end of this tutorial, you will be able to 
+
+.. 1. Save plots using ``savefig()`` function.
+.. #. Save plots in different formats.
+
+
+.. Prerequisites
+.. -------------
+
+..   1. should have ``ipython`` and ``pylab`` installed. 
+..   #. getting started with ``ipython``.
+..   #. using plot command interactively.
+     
+.. Author              : Anoop Jacob Thomas <anoop@fossee.in>
+   Internal Reviewer   : Puneeth
+   External Reviewer   :
+   Language Reviewer   : Bhanukiran
+   Checklist OK?       : <10-11-2010, Anand, OK> [2010-10-05]
+
+.. #[Puneeth: Quickref missing.]
+
+=======
+Savefig
+=======
+
+{{{ Show the first slide }}}
+
+Hello and welcome to the tutorial saving plots.
+
+{{{ switch to next slide, outline slide }}}
+
+In this tutorial you will learn how to save plots using Python, saving
+in different formats, and locating the file in the file system.
+
+.. #[Puneeth: file-system is too technical.]
+
+{{{ switch to next slide, a sine wave}}}
+
+Start your IPython interpreter with the command ::
+
+  ipython -pylab
+
+As you know, it will start your IPython interpreter with the required
+python modules for plotting and saving your plots.
+
+{{{ Open ipython }}}
+
+Now let us plot something, let us plot a sine wave from minus 3 pi to
+3 pi. Let us start by calculating the required points for the plot. It
+can be done using linspace as, ::
+
+  x = linspace(-3*pi,3*pi,100)
+
+We have stored required points in x. Now let us plot the points using
+the statement ::
+
+  plot(x,sin(x))
+
+{{{ Keep the plot open }}}
+
+Done! we have made a very basic sine plot, now let us see how to save
+the plot for future use so that you can embed the plot in your
+reports.
+
+.. #[Puneeth: All this is known stuff. You don't have to elaborate so
+.. much on it. Just say, let us plot sin function from -3 pi to 3
+.. pi. Show the commands, and be done with it. ]
+
+{{{ switch to next slide, savefig() }}}
+
+{{{ Switch the focus to IPython interpreter window }}}
+
+For saving the plot, we will use ``savefig()`` function, and it has to be
+done with the plot window open. The statement is, ::
+
+  savefig('/home/fossee/sine.png')
+
+Notice that ``savefig`` function takes one argument which is the
+filename. The last 3 characters after the ``.`` in the filename is the
+extension or type of the file which determines the format in which you
+want to save.
+
+.. #[Puneeth: removed mention of string]
+
+.. #[[Anoop: I think this treatment is better :) ]]
+
+{{{ Highlight the /home/fossee part using mouse movements }}}
+
+Also, note that we gave the full path or the absolute path to which we
+want to save the file.
+
+{{{ Highlight the .png part using mouse movements }}}
+
+Here I have used an extension ``.png`` which means I want to save the
+image as a PNG file.
+
+Now let us locate ``sine.png`` file saved. We saved the file to
+``/home/fossee`` so let us navigate to ``/home/fossee`` using the
+file browser.
+
+{{{ Open the browser, navigate to /home/fossee and highlight the file
+sine.png }}}
+
+Yes, the file ``sine.png`` is here and let us check it.
+
+{{{ Open the file sine.png and show it for two-three seconds and then
+close it and return to IPython interpreter, make sure the plot window
+is still open, also don't close the file browser window }}}
+
+{{{ switch to next slide, More on savefig() }}}
+
+So in-order to save a plot, we use ``savefig`` function. ``savefig``
+can save the plot in many formats, such as pdf - portable document
+format, ps - post script, eps - encapsulated post script, svg -
+scalable vector graphics, png - portable network graphics which
+support transparency etc.
+
+.. #[[slide must give the extensions for the files - Anoop]]
+
+{{{ switch to next slide, exercise 1 }}}
+
+Let us now try to save the plot in eps format. ``eps`` stands for
+encapsulated post script, and it can be embedded in your latex
+documents. Pause here and try to figure it out yourself.
+
+{{{ Switch focus to the already open plot window }}}
+
+We still have the sine plot with us, and now let us save the plot as
+``sine.eps``.
+
+{{{ switch to next slide, solution 1 }}}
+
+{{{ Switch focus to IPython interpreter }}}
+
+Now, We will save the plot using the function ``savefig`` ::
+
+  savefig('/home/fossee/sine.eps')
+
+{{{ Switch focus to file browser window }}}
+
+Now let us go to ``/home/fossee`` and see the new file created.
+
+{{{ Highlight the file sine.eps with a single mouse click for 2
+seconds and then double click and open the file }}}
+
+Yes! the new file ``sine.eps`` is here.
+
+{{{ switch to next slide, exercise 2 }}}
+
+Now you may try saving the same in pdf, ps, svg formats.
+
+{{{ Switch to summary slide }}}
+
+This brings us to the end of this tutorial, in this tutorial we
+learned to save plots using the function ``savefig()``. Saving the
+plots in different formats and locating the files in the file system.
+
+{{{ switch to Thank you slide }}}
+
+Thank you!
diff --git a/saving_plots/slides.org b/saving_plots/slides.org
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--- /dev/null
+++ b/saving_plots/slides.org
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+#+LaTeX_CLASS: beamer
+#+LaTeX_CLASS_OPTIONS: [presentation]
+#+BEAMER_FRAME_LEVEL: 1
+
+#+BEAMER_HEADER_EXTRA: \usetheme{Warsaw}\usecolortheme{default}\useoutertheme{infolines}\setbeamercovered{transparent}
+#+COLUMNS: %45ITEM %10BEAMER_env(Env) %10BEAMER_envargs(Env Args) %4BEAMER_col(Col) %8BEAMER_extra(Extra)
+#+PROPERTY: BEAMER_col_ALL 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 :ETC
+
+#+LaTeX_CLASS: beamer
+#+LaTeX_CLASS_OPTIONS: [presentation]
+
+#+LaTeX_HEADER: \usepackage[english]{babel} \usepackage{ae,aecompl}
+#+LaTeX_HEADER: \usepackage{mathpazo,courier,euler} \usepackage[scaled=.95]{helvet}
+
+#+LaTeX_HEADER: \usepackage{listings}
+
+#+LaTeX_HEADER:\lstset{language=Python, basicstyle=\ttfamily\bfseries,
+#+LaTeX_HEADER:  commentstyle=\color{red}\itshape, stringstyle=\color{darkgreen},
+#+LaTeX_HEADER:  showstringspaces=false, keywordstyle=\color{blue}\bfseries}
+
+#+TITLE: Savefig
+#+AUTHOR: FOSSEE
+#+EMAIL: info@fossee.in    
+#+DATE: 2010-10-11 Mon
+
+#+DESCRIPTION: 
+#+KEYWORDS: 
+#+LANGUAGE:  en
+#+OPTIONS:   H:3 num:nil toc:nil \n:nil @:t ::t |:t ^:t -:t f:t *:t <:t
+#+OPTIONS:   TeX:t LaTeX:nil skip:nil d:nil todo:nil pri:nil tags:not-in-toc
+
+* Outline
+  - Saving plots.
+  - Plotting in different formats.
+  - Locating the file in the file system.
+
+* Creating a basic plot
+  Plot a sine wave from -3pi to 3pi.
+  #+begin_src python
+    In []: x = linspace(-3*pi,3*pi,100)
+    
+    In []: plot(x, sin(x))
+  #+end_src
+* savefig()
+** savefig() - to save plots
+   : syntax: savefig(fname)
+** example
+*** savefig('/home/fossee/sine.png')    
+   - file sine.png saved to the folder /home/fossee
+   - .png - file type
+
+* More on savefig()
+** Recall
+   - .png - file type
+** File types supported
+*** .pdf - PDF(Portable Document Format)
+*** .ps - PS(Post Script)
+*** .eps - Encapsulated Post Script
+    ~to be used with~ LaTeX ~documents~
+*** .svg - Scalable Vector Graphics
+    ~vector graphics~
+*** .png - Portable Network Graphics
+    ~supports transparency~
+* Exercise 1
+  Save the sine plot in the format EPS which can be embedded in LaTeX documents.
+* Solution 1
+  #+begin_src python
+    savefig('/home/fossee/sine.eps')
+  #+end_src
+* Exercise 2
+  Save the sine plot in PDF, PS and SVG formats.
+
+* Summary
+  You should now be able to
+  - Use ~savefig()~ function
+  - Save plots in different formats
+      - PDF
+      - PS
+      - PNG
+      -	SVG
+      - EPS
+  - Locating the files in file system.
+    
+* Thank you!
+#+begin_latex
+  \begin{block}{}
+  \begin{center}
+  This spoken tutorial has been produced by the
+  \textcolor{blue}{FOSSEE} team, which is funded by the 
+  \end{center}
+  \begin{center}
+    \textcolor{blue}{National Mission on Education through \\
+      Information \& Communication Technology \\ 
+      MHRD, Govt. of India}.
+  \end{center}  
+  \end{block}
+#+end_latex
+
+
diff --git a/saving_plots/slides.tex b/saving_plots/slides.tex
new file mode 100644
index 0000000..06d530b
--- /dev/null
+++ b/saving_plots/slides.tex
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+% Created 2010-10-11 Mon 17:08
+\documentclass[presentation]{beamer}
+\usepackage[latin1]{inputenc}
+\usepackage[T1]{fontenc}
+\usepackage{fixltx2e}
+\usepackage{graphicx}
+\usepackage{longtable}
+\usepackage{float}
+\usepackage{wrapfig}
+\usepackage{soul}
+\usepackage{t1enc}
+\usepackage{textcomp}
+\usepackage{marvosym}
+\usepackage{wasysym}
+\usepackage{latexsym}
+\usepackage{amssymb}
+\usepackage{hyperref}
+\tolerance=1000
+\usepackage[english]{babel} \usepackage{ae,aecompl}
+\usepackage{mathpazo,courier,euler} \usepackage[scaled=.95]{helvet}
+\usepackage{listings}
+\lstset{language=Python, basicstyle=\ttfamily\bfseries,
+commentstyle=\color{red}\itshape, stringstyle=\color{darkgreen},
+showstringspaces=false, keywordstyle=\color{blue}\bfseries}
+\providecommand{\alert}[1]{\textbf{#1}}
+
+\title{Savefig}
+\author{FOSSEE}
+\date{2010-10-11 Mon}
+
+\usetheme{Warsaw}\usecolortheme{default}\useoutertheme{infolines}\setbeamercovered{transparent}
+\begin{document}
+
+\maketitle
+
+
+
+
+
+
+
+
+
+\begin{frame}
+\frametitle{Outline}
+\label{sec-1}
+
+\begin{itemize}
+\item Saving plots.
+\item Plotting in different formats.
+\item Locating the file in the file system.
+\end{itemize}
+\end{frame}
+\begin{frame}[fragile]
+\frametitle{Creating a basic plot}
+\label{sec-2}
+
+  Plot a sine wave from -3pi to 3pi.
+\begin{verbatim}
+In []: x = linspace(-3*pi,3*pi,100)
+
+In []: plot(x, sin(x))
+\end{verbatim}
+\end{frame}
+\begin{frame}[fragile]
+\frametitle{savefig()}
+\label{sec-3}
+\begin{itemize}
+
+\item savefig() - to save plots
+\label{sec-3_1}%
+\begin{verbatim}
+    syntax: savefig(fname)
+\end{verbatim}
+
+
+\item example
+\label{sec-3_2}%
+\begin{itemize}
+
+\item savefig('/home/fossee/sine.png')
+\label{sec-3_2_1}%
+\begin{itemize}
+\item file sine.png saved to the folder /home/fossee
+\item .png - file type
+\end{itemize}
+
+
+\end{itemize} % ends low level
+\end{itemize} % ends low level
+\end{frame}
+\begin{frame}
+\frametitle{More on savefig()}
+\label{sec-4}
+\begin{itemize}
+
+\item Recall
+\label{sec-4_1}%
+\begin{itemize}
+\item .png - file type
+\end{itemize}
+
+
+\item File types supported
+\label{sec-4_2}%
+\begin{itemize}
+
+\item .pdf - PDF(Portable Document Format)\\
+\label{sec-4_2_1}%
+\item .ps - PS(Post Script)\\
+\label{sec-4_2_2}%
+\item .eps - Encapsulated Post Script\\
+\label{sec-4_2_3}%
+\texttt{to be used with} \LaTeX{} \texttt{documents}
+
+\item .svg - Scalable Vector Graphics\\
+\label{sec-4_2_4}%
+\texttt{vector graphics}
+
+\item .png - Portable Network Graphics\\
+\label{sec-4_2_5}%
+\texttt{supports transparency}
+\end{itemize} % ends low level
+\end{itemize} % ends low level
+\end{frame}
+\begin{frame}
+\frametitle{Exercise 1}
+\label{sec-5}
+
+  Save the sine plot in the format EPS which can be embedded in \LaTeX{} documents.
+\end{frame}
+\begin{frame}[fragile]
+\frametitle{Solution 1}
+\label{sec-6}
+
+\begin{verbatim}
+savefig('/home/fossee/sine.eps')
+\end{verbatim}
+\end{frame}
+\begin{frame}
+\frametitle{Exercise 2}
+\label{sec-7}
+
+  Save the sine plot in PDF, PS and SVG formats.
+\end{frame}
+\begin{frame}
+\frametitle{Summary}
+\label{sec-8}
+
+  You should now be able to
+\begin{itemize}
+\item Use \texttt{savefig()} function
+\item Save plots in different formats
+
+\begin{itemize}
+\item PDF
+\item PS
+\item PNG
+\item SVG
+\item EPS
+\end{itemize}
+
+\item Locating the files in file system.
+\end{itemize}
+
+    
+\end{frame}
+\begin{frame}
+\frametitle{Thank you!}
+\label{sec-9}
+
+  \begin{block}{}
+  \begin{center}
+  This spoken tutorial has been produced by the
+  \textcolor{blue}{FOSSEE} team, which is funded by the 
+  \end{center}
+  \begin{center}
+    \textcolor{blue}{National Mission on Education through \\
+      Information \& Communication Technology \\ 
+      MHRD, Govt. of India}.
+  \end{center}  
+  \end{block}
+\end{frame}
+
+\end{document}